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Question

Choose the correct option(s) for following compounds:

A
I shows π bond - π bond conjugation.
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B
II shows π bond - lone pair conjugation.
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C
II shows lone pair - vacant orbital conjugation.
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D
III shows π bond - π bond conjugation.
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Solution

The correct option is C II shows lone pair - vacant orbital conjugation.
Benzene molecule has 3 π bonds which are in conjugation with each other. Therefore, it will show π bond - π bond type of conjugation.

In the molecule II, lone pair of O atom conjugates with the vacant p orbital of the sp2 carbon. So, II shows lone pair - vacant orbital conjugation.
In III terminal CH2 , carbon center has one negative charge which is in conjugation with π-bond or double bond.
So, it shows π bond- Negative charge conjugation.


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